Home
Current Affairs January 2024

What is the correct answer?

4

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A. More

B. Less

C. Same

D. Could be more or less depending on other factors

Correct Answer :

A. More


Related Questions

What is the correct answer?

4

The ratio of the workdone on the blades to the energy supplied to the blades, is called

A. Blading efficiency

B. Nozzle efficiency

C. Gross or stage efficiency

D. Mechanical efficiency

What is the correct answer?

4

When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as

A. Internally fired boiler

B. Externally fired boiler

C. Natural circulation boiler

D. Forced circulation boiler

What is the correct answer?

4

Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economiser (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

A. 48 : 20 : 15 : 7 : 10

B. 10 : 7 : 15 : 20 : 48

C. 20 : 48 : 7 : 15 : 10

D. 7 : 15 : 20 : 10 : 48

What is the correct answer?

4

The balanced draft furnace is one using

A. Induced draft fan and chimney

B. Induced draft fan and forced draft fan

C. Forced draft fan and chimney

D. Any one of the above

What is the correct answer?

4

Rateau turbine is

A. Simple reaction turbine

B. Velocity compounded turbine

C. Pressure compounded turbine

D. Pressure-velocity compounded turbine

What is the correct answer?

4

De-Laval turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these

What is the correct answer?

4

The fire tubes in a Locomotive boiler has _________ diameter.

A. 4.75 mm

B. 5.47 mm

C. 7.45 mm

D. 47.5 mm

What is the correct answer?

4

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A. More

B. Less

C. Equal

D. None of these

What is the correct answer?

4

The major axis of elliptical manholes on the shell should be provided

A. Longitudinally

B. Circumferentially

C. On dished end

D. Anywhere

What is the correct answer?

4

Locomotive type' boiler is

A. Horizontal multi-tubular water tube boiler

B. Water wall enclosed furnace type

C. Vertical tubular fire tube type

D. Horizontal multi-tubular fire tube type

What is the correct answer?

4

In a reaction turbine

A. The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades

B. The expansion of steam takes place partly in the fixed blades and partly in the moving blades

C. The steam is expanded from a high pressure to a condenser pressure in one or more nozzles

D. The pressure and temperature of steam remains constant

What is the correct answer?

4

The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

A. Remains constant

B. Decreases

C. Increases

D. None of these

What is the correct answer?

4

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency

What is the correct answer?

4

Which of the following is steam dial?

A. Non-coking bituminous coal

B. Brown coal

C. Pulverised coal

D. Coking bituminous coal

What is the correct answer?

4

The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

A. 180° to each other

B. 90° to each other

C. 0° to each other

D. None of these

What is the correct answer?

4

The diameter of superheated tubes in a locomotive boiler is

A. 13 mm

B. 31 mm

C. 130 mm

D. 230 mm

What is the correct answer?

4

Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

What is the correct answer?

4

The nozzle efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

What is the correct answer?

4

The basic purpose of drum in boiler is to

A. Serve as storage of steam

B. Serve as storage of feed water for water wall

C. Remove salts from water

D. Separate steam from water

What is the correct answer?

4

Fire tube boilers are limited to a maximum working pressure of

A. 0.17 MN/m²

B. 1.7 MN/m²

C. 17 MN/m²

D. 170 MN/m²

What is the correct answer?

4

A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

A. 1.05

B. 2.86

C. 6.65

D. 10.05

What is the correct answer?

4

Curtis turbine is a

A. Simple reaction turbine

B. Velocity compounded turbine

C. Pressure compounded turbine

D. Pressure-velocity compounded turbine

What is the correct answer?

4

In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.

A. Equal to

B. Lower than

C. Higher than

D. None of these

What is the correct answer?

4

In cross compounding, the cylinders are arranged

A. Side by side and each cylinder has common piston, connecting rod and crank

B. Side by side and each cylinder has separate piston, connecting rod and crank

C. At 90° and each cylinder has common piston, connecting rod and crank

D. At 90° and each cylinder has separate piston, connecting rod and crank

What is the correct answer?

4

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A. Surface condenser

B. Jet condenser

C. Barometric condenser

D. Evaporative condenser

What is the correct answer?

4

Which is not the correct statement about moisture in coal?

A. Inherent moisture and surface moisture are different things

B. In some coals moisture may be present up to 40%

C. Some moisture in coal helps in better burning which is not possible with completely dry coal

D. It increases thermal efficiency

What is the correct answer?

4

The condition of steam in boiler drum is always

A. Dry

B. Wet

C. Saturated

D. Supersaturated

What is the correct answer?

4

When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

A. Slow speed engine

B. Vertical steam engine

C. Condensing steam engine

D. Non-condensing steam engine

What is the correct answer?

4

The variation of steam pressure in the nozzle depends upon

A. Velocity of steam

B. Specific volume of steam

C. Dryness fraction of steam

D. All of these

What is the correct answer?

4

Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

A. pa = pm/K

B. pa = pm × K

C. pa = K/pm

D. pa = pm + K